My party of six level 10 powerful adventurers are heading to a fighting pit, for our last session before our two week holiday break. Give me the most fun/craziest shit I can throw at them.

Title, really. I can justify mostly anything or reskin, and I do have ideas on my own. Just, you know, a subreddit worth of minds think more than one, ideally looking for things I don't know and I'm not aware even exist.